2 Toslink cables, 1 input...

 Hello all, I'm hoping someone can point me towards a simple item or solution.

 Summed up, I have an Xbox360 and a PS3. Both have digital audio out, in toslink format. My amp has only one digital in. So I have dig around swapping cables. Not ideal.

 
Can anyone point me at a simple switch / box that will accept multiple toslink inputs and one out, to my amp?

Many thanks

Neph.